package com.jet.javatest.socket;

import com.jet.protobuf.SubscribeRespProto;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufEncoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32LengthFieldPrepender;

/**
 * Description:
 * File: SubReqClient.java
 * Author: Administrator
 * Create: 2019/11/6 11:25
 */
public class SubReqClient {
    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        int port = 8080;
        if (args != null && args.length > 0) {
            try {
                port = Integer.valueOf(args[0]);
            } catch (NumberFormatException e) {
                // 采用默认值
            }
        }
        new SubReqClient().connect(port, "127.0.0.1");
    }

    public void connect(int port, String host) throws Exception {
        // 配置客户端NIO线程组
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();
            b.group(group)
                    .channel(NioSocketChannel.class)
                    .option(ChannelOption.TCP_NODELAY, true)
                    .handler(
                            new ChannelInitializer<SocketChannel>() {
                                @Override
                                public void initChannel(SocketChannel ch) throws Exception {
                                    ch.pipeline().addLast(new ProtobufVarint32FrameDecoder());
                                    ch.pipeline()
                                            .addLast(
                                                    new ProtobufDecoder(
                                                            SubscribeRespProto.SubscribeResp.getDefaultInstance()));
                                    ch.pipeline().addLast(new ProtobufVarint32LengthFieldPrepender());
                                    ch.pipeline().addLast(new ProtobufEncoder());
                                    ch.pipeline().addLast(new SubReqClientHandler());
                                }
                            });

            // 发起异步连接操作
            ChannelFuture f = b.connect(host, port).sync();

            // 当代客户端链路关闭
            f.channel().closeFuture().sync();
        } finally {
            // 优雅退出，释放NIO线程组
            group.shutdownGracefully();
        }
    }
}
